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Genetic Variation in Vigor in a White Pine Incomplete Diallel Cross Experiment at Age 6

The use in forestry of the diallel cross for estimating genetic parameters of the population assumes (1) that the parent population is random-mating and in equilibrium, and (2) that the trees tested are a random sample of the population. A "modified diallel" crossing system must be used, in which families obtained by selfing are excluded from the analysis. The analysis may include or exclude reciprocals. General and specific combining ability components of variance provide estimates of additive and non-additive genotypic components of variance (Griffing, 1956). The study reported herein is considered to be a reasonable approximation of these conditions. It was designed to estimate genetic and environmental components of variance in vigor in a small breeding population of native eastern white pine (Pines strobus L.) in central Ohio. Analyses of the experiment at ages 1, 2, and 3 were reported in an earlier paper, along with similar analyses of another diallel cross experiment and of open-pollinated progenies, all from the same breeding population (Kriebel, Namkoong, and Usanis, 1972).


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Author(s): Howard B. Kriebel, James H. Roberds, R. V. Cox

Publication: Tree Improvement and Genetics - Central States Forest Tree Improvement Conference - 1972